An effective calibration technique for radiochromic films using a single-shot dose distribution in Gamma Knife(®)

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
Jae Pil ChungHyun-Tai Chung

Abstract

A method of calibrating radiochromic films for Gamma Knife(®) (GK) dosimetry was developed. The applicability and accuracy of the new method were examined. The dose distribution for a sixteen millimeter single-shot from a GK was built using a reference film that was calibrated using the conventional multi-film calibration (MFC) method. Another film, the test film, from a different set of films was irradiated under the same conditions as the reference film. The calibration curve for the second set of films was obtained by assigning the dose distribution of the reference film to the optical density of the test film, point by point. To assess the accuracy of this single-film calibration (SFC) method, differences between gamma index pass rates (GIPRs) were calculated. The SFC curves were successfully obtained with estimated errors of 1.46%. GIPRs obtained with the SFC method for films irradiated using a single-shot showed differences less than one percentage point when dose difference criterion (ΔD) was 2% and the distance to agreement criterion (Δd) was 1 mm. The GIPRs of the SFC method when the films were irradiated following a virtual target treatment plan were consistent with the GIPRs of the MFC method, with differences of les...Continue Reading

References

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Jun 3, 1998·Medical Physics·D A LowJ A Purdy
Feb 13, 2010·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Hani AlnawafPeter K N Yu
Aug 31, 2010·International Journal of Radiation Oncology, Biology, Physics·Hyun-Tai ChungKook Jin Chun
Nov 6, 2010·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Slobodan Devic
Oct 14, 2011·Medical Physics·Jeong-Hoon ParkHyun-Tai Chung
Sep 7, 2012·Physics in Medicine and Biology·Liyun ChangSheng-Yow Ho
May 25, 2015·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Oliver BlanckBjörn Poppe

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Citations

Nov 21, 2019·Physics in Medicine and Biology·Carmen Ruiz-MoralesAntonio González-López
Dec 21, 2019·Physics in Medicine and Biology·A LogothetisP Karaiskos
Jun 4, 2019·The Review of Scientific Instruments·J H BinT Schenkel
Mar 12, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Manon SpaniolFlorian Stieler

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